Détails:Vickers Viking D-BELA departed London at 10:01 GMT on a flight to Düsseldorf, Germany.The flight proceeded normally until halfway roughly between Dover and Wulpen. At this time, at an altitude of 7000 feet, the crew perceived some hiccups in the right engine. The boost fluctuated and the RPM varied +/- 50 revolutions/min.The captain assumed that it was caused by icing, activated carburettor heaters and gave some brief shots of alcohol. After these actions the situation seemingly became normal.Just before reaching Wulpen, the right hand engine boost fell to 25". The oil pressure fell to 60 - 70 psi (normal pressure is 80 psi). The cylinder temperature was normal. The captain decided to shut down the engine and feather the prop.The crew contacted Brussels and were cleared to descend and divert to Brussels Airport. The pilot manoeuvred around some rain showers during the descent towards Brussels. At 11:55 local time the flight reported at 1500 feet, and almost at the Mackel beacon. The flight crew were not able to maintain altitude so the captain decided to restart the no. 2 engine. He instructed the copilot to carry out the restart. The copilot failed to use a checklist while performing the actions to restart the engine. A few minutes later the crew noticed that the right engine was on fire. Three fire extinguishing bottles were fired, but the fire was not contained. The captain then carried out an emergency descent. The airplane came down in a field next to the village of Kamershoek. It burst into flames after the three crew members exited the plane.